AIAdvanced#Security#Custody#Cryptography
MPC Wallet (Multi-Party Computation)
M
Definition
A cryptographic design in which parties jointly perform a signing or other key operation without exposing their private inputs to one another. The security outcome depends on the threshold, implementation, device isolation, policy, recovery, and operators.
Source reviewed
- NIST: Multi-Party Threshold Cryptography opens in a new tab
Supports: NIST explains that threshold schemes use MPC to distribute trust and perform cryptographic operations while secret sharing remains in place, with security depending on the defined threshold.
- NIST IR 8214C: First Call for Multi-Party Threshold Schemes opens in a new tab
Supports: NIST describes distributed signing, encryption, decryption, and key generation where a private key is secret shared across parties rather than treated as one implementation-independent product feature.
Concept Diagram
Key Takeaways
1
MPC lets parties jointly compute a cryptographic operation without sharing their private inputs.
2
A threshold can reduce exposure to fewer compromised parties, but does not remove implementation, policy, recovery, or operator risk.
3
Document signers, threshold, device controls, policy, logs, recovery, rotation, and who can change them.
4
Keep AI workflows draft-first and enforce signing limits outside the model.
Practical Example
A 2-of-3 signing policy assigns separate authenticated devices to named operators. A withdrawal proposal shows the destination, amount, policy check, and approval log; two authorized signers must participate. The service also has a tested recovery and revocation process, because the threshold alone does not cover every failure mode.
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Related Terms
AI
Agentic WalletA wallet or smart-account workflow that gives software an explicitly bounded ability to prepare or execute actions. It is an implementation pattern, not an ERC-4337 feature, safety guarantee, or reason to grant a model unrestricted signing authority.
AI
TEE (Trusted Execution Environment)A hardware-backed isolated execution environment that can protect specified code and data under an explicit platform threat model. Its assurance depends on the implementation, attestation policy, measured software, key release, configuration, and remaining hardware and software attack surface.
AI
Multi-Agent System (MAS)A system in which multiple software agents or services perform bounded, coordinated tasks. Splitting work can improve separation of concerns, but it does not verify outputs, eliminate a single point of failure, or make a financial decision safe.
Blockchain
Private KeySecret key material used to create signatures that authorize transactions for a particular blockchain account or output. It is not itself a password, a public address, or proof of legal ownership, and wallet recovery depends on the wallet's key-management design.
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